I just tried out FreshPatents.Com, a patent keyword monitoring offered as a free service. You can monitor just your niche, for example, under the category "Drug, bio-affecting and body treating compositions" with recently published patent applications available by RSS feed and e-mail. The listing format includes USPTO National Class full category number, link to abstract/description, and title of the patent application. You have to register to get set up but it offers a good way to monitor certain classifications. There is even a patent highlights feed.
Cool feature: Click on the button at the type labeled "Agents" and you can see all the applications that published by law firm name.
